Due to its unique size (read: really damn small), Apple’s iPod nano is a little light in the third-party accessory department. Ignitek hopes to fill a void with its iCheer 212, a portable speaker set designed to dock directly to the nano. The speakers are powered by four AA batteries and can also be hooked up to your PC or Mac via the supplied USB cable. One watt of pure sonic power, now small enough to turn any boring social situation into an instant dance party!
http://www.mobilewhack.com/reviews/icheer_212_speaker_system_for_ipod_nano.html